Error boundaries are React components that catch JavaScript errors in their child component tree and display a fallback UI.

Error boundaries only exist in class based components

import React from 'react';

class ErrorBoundary extends React.Component {
    constructor(props) {
        super(props);
        this.state = { hasError: false };
    }

    static getDerivedStateFromError(error) {
        return { hasError: true };
    }

    componentDidCatch(error, info) {
        console.error("Error caught:", error, info);
    }

    render() {
        if (this.state.hasError) {
            return <h1>Something went wrong.</h1>;
        }

        return this.props.children; 
    }
}

const BuggyComponent = () => {
    throw new Error("I crashed!");
};

const App = () => {
    return (
        <ErrorBoundary>
            <BuggyComponent />
        </ErrorBoundary>
    );
};